X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 14 - serial i/o

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INT 14 - SERIAL I/O - RECEIVE CHARACTER
        AH = 02h
        DX = port number (0-3)
Return: AL = character received
        AH = RS-232 status code (see AH=00h)
Note:   will timeout if DSR is not asserted, even if function 03h returns
          data ready
SeeAlso: AH=01h,AH=84h

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